diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index f4132ba..7629a3d 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -21,8 +21,8 @@ cd mcp-logseq
 # Install dependencies
 uv sync
 
-# Install development dependencies
-uv sync --dev
+# Install development dependencies (including vector extras required for tests)
+uv sync --dev --extra vector
 ```
 
 ### 2. Environment Configuration